Converted Observatory object-common element

runtime/observatory/lib/src/repositories/reachable_size.dart

+// Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file
+
+part of repositories;
+
+class ReachableSizeRepository implements M.ReachableSizeRepository {
+
+  Future<M.Guarded<M.Instance>> get(M.IsolateRef i, String id) async {
+    S.Isolate isolate = i as S.Isolate;
+    assert(isolate != null);
+    final response = await isolate.invokeRpc('_getReachableSize', {
+        'targetId' : id
+    });
+    return new S.Guarded<S.Instance>(response);
+  }
+}